Throttle-valve lock for pneumatic hammers.



PATENTED JULY 28, 1903.

G. H. HAESELER. THROTTLE VALVE LOOK FOR PNEUMATIC HAMMERS.

APPLICATION FILED MAY 26. 1903.

N0 MODEL.

INVENTOR A TTORNEHF,

WITNESSES are. 734,700..

'NITED STATES Patented July 28, 1903.

HAESELER-INGERSOLL PNEUMATIC TOOL N. Y., A CORPORATION OF VIRGINIA.

COMPANY, or NEW YORK,

THROTTLE-VALVE LocK'F oR PNEUMATIC HAMMERS.

EiIEECIFICATIQN forming part of Letters Patent N0.'734,'700, dated July 28, 1903.

Application filed May 26, 1903. Serial No. 158,777. (No model.)

To all whom it may concern.-

Be it known that LCnA'aLns H. HAEsELnaa citizen of the United States, residing at Easton,connty ofNorthampton,andStateof Pennsylvania, have invented a new-and useful Improvement in Throttle-ValveLocks for Pneumatic Hammers,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, which form-apart of this specification.

My invention relates to the valve mechanism for controlling the entrance of motive fluid through the handle of a pneumatic tool into the cylinder thereof.

The invention has for its object to positively lock the controlling or throttle valve from movement when in its closed position, while permitting it to be readily opened when it is desired to put the tool into operation. a

In apatent issued to me on the 26th day of August, 1902, No. 707,920, I show, describe, and claim a construction wherein a valve normally closing the main air-passage is normally locked in its closed position. The type of valve shown therein is a piston-valve, and the specific locking device shown therein consists of a spring-pressed pin adapted to en'- gage a cut-away portionin the valve-stem. This specifictypeof lock'is eminently satisfactory when applied to a piston-valve, but is open to more or less objection when applied to the disk type of valve. The reason for this objection is that wherea pin is provided for engaging a cut-away portion in the valve-stem more or less play must be allowed between the pin and such cut-away portion in order to insure that the pin shall seat itself therein. This permits the valve-stem, even when locked, to move slightly in the direction of its axis, a condition that is not objectionable witha piston-valve, as it wholly closes the port it controls within a certain limited range of movement of the'valve along heads; but with a diskvalve the slightest lift of the valve ofi its seat permits a leakage of the motivefi'uid.

The object of=the present invention, therefore, more specifically stated, is to absolutely lock the valvevfrom an appreciable movement whatever.

In the drawings, Figure 1 is a sectional view of the handle of a pneumatic tool and the locking mechanism, showing the throttlevalve in its locked position. Fig. 2 isa view of the same parts, showing the valve in its unlocked position.

a is the handle, provided with the open portion (9 to receive the fingers. The handle is reduced to form a cylindrical portion 01, pro vided with an internal screw-th read,by means of which the cylinder (not shown) may be secured to the handle. The passage 0 for the compressed air or other motive fluid extends through the handle, being provided at one end with a screw-thread, by means of which a hose maybe attached, and at the other end opening into the cylindrical portion at.

ef represent a cylindrical valve-chamber formed in the grasping portion of the handle and intersecting the passage 0 and having an enlargedportion e and a reduced portion f.

g is a port in the enlarged part of the valvechamber, said port opening into the ingress 'end of the passage 0.

h is a port in the reduced part of the valvechamber, saidport communicating with the egress end of the passage 0.

Qlj is Z represent the throttle-valve, the head tof which normally rests against the shoulder formed at the junction of the reduced and enlarged portions of the valve chamber and closes communication between the same. The stem of the valve consists of the cylindrical portion 7t, fitting closely within the reduced part f of the valve-chamber, the contracted.

portionj,connecting the headiand cylindrical portion is, and the reduced end Z, extending beyond the inner end of the valve-chamber and into the body of the handle. A spring m is confined between the valve-headt'and the outer closed end of the valve-chamber and normally holds the valve-head on its seat.

To admit pressure fluid to the interior of the tool, the valve is lifted from its seat against the action of spring m, whereupon the compressed air flows into the port 9 through the valve-chamber and around the contracted portionj of the valve-stem out of port 71., and thence to the cylinder.

The following means are provided'for unseating the valve and for locking it when seated:

'n is a lever extending into a recess in the grasping portion of the handle and pivoted near its inner end, which is provided with a shoulder, between which and the reduced rear end of the valve a roller or ball 0 is confined. The outer end of the lever extends without the handle and has a thumb-piece p, a projecting portion q, and an inclined face to.

r is a locking-lever pivoted near its lower end, the upper end normally engaging the projecting portion of the valve-lever 91, the locking-lever also being provided between its ends with a finger-piece 5, extending laterally into the open portion 1). The face t of the lower end of the locking-lever is inclined and is engaged by a pin it, normally pressed upwardly by a spring '0, said pin and spring being seated in a cylindrical chamber whose lower end extends into the cylindrical por tion d of the handle.

Normallythepartsarein the position shown in Fig. 1. The spring 12 forces the pin 'Lt against the inclined face if of the lever r, and the upper end of lever r engages the projecting portion q of the valve-lever 11,, holding the latter in its extreme oute'r position and permitting the spring m to act to hold the throttle-valve on its seat, thereby effectually preventing the escape of the compression fluid through the valve-chamber. No accidental displacement of the valve is possible, as it can only be retracted through the medium of valve-lever n, which is immovahly locked by the locking-lever "1'.

To open the throttle-valve, the operator grasps the handle and with the forefinger retracts the lever against the pressure of spring 12, causing said lever to swing clear of the projecting portion q of lever 71.. By pressing his thumb against the thumb-piecep the operator depresses the lever 12, the inclined end to of the lever n acting as a cam upon the upper end of the lever r and causing lever r to swing to its extreme outer position. Dopression of the levernalso moves the throttlevalve outwardly in its chamber, unseatin g its head i and permitting pressure fluid to pass through the valve-chamber to the cylinder. The position of the parts when the throttlevalve is open is shown in Fig. 2. When the operator releases his grasp of the handle, the spring m at once acts to seat the valve, which in turn returns lever W. to its normal position. Simultaneously the spring 1 acts to return the lever r to its normal position, thus again locking the lever 11 and the throttle-valve.

It is obvious that my invention is not limited in its application to any special type of valve, but will be found highly useful in connection with any valve that it is desired to hold immovable when closed.

Having now fully described my invention, what I claim, and desire to protect by Letters Patent, is

1. In a pneumatic hammer, the combination with the handle, of an air-passage in said handle, a valve controlling the pressure of air through said air-passage, a lever adapted to control the operation of said valve, and means adapted to directly engage and lock said lever.

2. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve normally closing said air-passage, a lever engaged by said valve, and means adapted to directly engage said lever and lock it in the position into which it is moved by said valve.

3. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve normally closing said air-passage, a pivoted. lever engaging said valve and adapted to be operated to open said valve, but normally moved by said valve into its inoperative position, and means adapted to directly engage said lever and lock it in its inoperative position.

4. In a pneumatic hammer, the combination with thehandle, of an air-passage therein, a valve normally closing said air-passage, a pivoted lever whose pivoted end extends into a recess in said handle and engages said valve, the outer end of said lever normally projecting without the handle, a thumb-piece on the outer end of the said lever by means of which the lever is moved into the recess thereby moving the valve to open the passage, and means adapted to directly engage said lever and lock it in its inoperative position.

5. ,In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve controlling the flow of air through said passage, a lever pivoted near one end and having a shoulder engaging said valve,

and means adapted to directly engage and lock said lever.

6. In a pneumatic hammer, the combination with the handle, of an'air-passage therein, a valve controlling the passage of air through said passage, a lever pivoted near one end and having a shoulder engaging said valve, the opposite end of said lever having a thumb-piece, and meansadapted to directly engage and lock said lever.

7. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve controlling the passage of air through said passage, a valve-lever adapted to control the operation of said valve, and a locking-lever adapted to engage and lock the valve-lever.

8. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve controlling the passage of air through said passage, a valve-lever adapted to control the operation of said valve, said 1ever having a thumb-piece, and a locking-lever adapted to engage and lock the valve-lever, the looking-lever having a finger-piece.

9. In a pneumatic hammer, the combination with the handle having an open portion for the reception of the fingers, of an air-passage in the handle, a valve normally closing said air-passage, a pivoted valve-lever Whose pivoted end extends into a recess in said handle and engages said valve, the outer end of said lever normally projecting without said handle, a thumb-piece on the outer end of said lever by means of which the lever is moved to actuate the valve to open said airpassage, a locking-lever adapted to engage and lock the valve-lever, and a finger-piece on the locking-lever normally extending into the open portion of the handle.

10. In a pneumatic hammer, the combination with the handle having an open portion forthe reception of the fingers, of an air-passage in the handle, a valve controlling the passage of air through said passage, a valve-1ever adapted to control the operation of the valve, a locking-lever adapted to engage and lock the valve-lever, and a finger-piece on the locking-lever normally extending into the open portion of the handle.

11. In a pneumatic hammer, the combination with the handle having an open portion for the reception of the fingers, of an air-passage in the handle, a valve controlling the passage of air through said passage, a valve-lever adapted to control the operation of the valve, a locking-lever adapted to engage and lock the valve-lever, a finger-piece on the locking-lever normally extending into they open portion of the handle, and a spring normally holding said locking-lever in looking engagement with the valve-lever.

12. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve controlling the passage of air through said passage, a pivoted valve-lever adapted to control the operation of the valve, the free end of said lever having an inclined face, and a pivotedlocking-lever whose free end normally engages and locks the valve-1ever, but which, after the lockingdever is moved to unlock the valve-lever, is adapted to be moved along the inclined face of the free end of the valve-lever into its extreme unlocking position. i

' 13. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve, a spring adapted to normally move said valve into position to close said passage, a valve-lever adapted to be moved away from its normal position to move said valve to open said passage against the tension of the spring, and also adapted to be moved into its normal position by means of the valve-spring, a looking leveradapted to lock the valve lever when the latter is in its normal position, and a spring adapted to normally hold said locking-lever in looking position.

14. In a pneumatic hammer, the combination, with the handle, of an air-passage therein, a valve controlling the passage of air through said passage, a va1ve-lever adapted to control the operation of said valve, alocking-lever adapted to engage and lock the valve-lever, and means for moving the locking-lever into position to unlock the valvelever.

15. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve controlling the passage of air through said air-passage, a valve-lever controlling the operation of said valve, a lockinglever adapted to engage and lock the valvelever, means for moving said locking-lever to unlock the valve-lever, and means whereby in the subsequent operation its valve-lever will move said locking-lever a farther distance from its locking position. p

' 16. In a pneumatic hammer, the combination with the handle having an open-portion for the reception of the fingers, of an air-passage therein, a valve, a spring adapted to nor mally move said valve into position to close said passage, a valve-lever, the outer edge of which normally projects without the handle, a thumb-piece on the outer end of said valvelever, whereby the valve-lever may be moved away from its normal position to move said valve to open said passage against the ten sion of the valve-spring, said valve-lever being adapted to be moved into its normal position by means of the valve-spring, a locking-lcver adapted to engage and lock the valve-lever when the latter is in its normal vposition, a spring adapted to normally hold said locking-lever in looking position, and a finger-piece on the locking-lever extending into the open portion of the handle by means of which the locking-lever is moved into position to unlock the valve-lever.

17. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve controlling the passage of air through said passage, a valve-lever adapted tocontrol the operation of said valve, a locking-lever adapted to engage and lock the valve-lever, a pin movable in a chamberin said handle, and a spring seated in said chamher and pressing said pin against one end of the looking-lever, thereby normally holding it in looking position.

'18. In a pneumatic hammer, the combination with the handle having an open portion, an air-passage in the handle, a valve in said air-passage, a spring normally closing said valve, a pivoted valve-lever whose pivoted end has a shoulder engaging said valve, a thumb-piece and a projection on the free end of the valve-lever, a pivoted locking-lever whose free end engages said projection, a finger-piece on the locking-lever extending into said open portion, a pin movable in a chamber formed in the handle, and a spring seated in said chamber, normally pressing said pin against the end of the locking-lever adjacent to its pivot.

19. In a pneumatic hammer, the combination with a handle, of an air-passage therein, a valve controlling the passage of air through said air-passage,a val ve-lever controlling said valve, said valve-lever having an inclined face on its free end, and a locking lever whose free end is adapted to slide along and beyond said inclined face and lock said valvelever.

20. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve-chamber interposed in said passage, a disk valve seated in said valve-chamber, and normally closing communication between the two ends thereof, a port in one end of said valve-chamber and on one side of said valve communicating with the ingress end of said passage, a port in the other end of said valve-chamber and on the other side of said valve communicating with the egress end of said passage, a spring adapted to hold said valve in its normal position, and means for locking said valve from any movement ofitits seat. I

21. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve-chamber interposed in said passage, a valve seated in said valve-chamber and normally closing comm unication between the two ends thereof, a ,port in said valvechamber on one side of said valve communi-' eating with the ingress end of said passage, a port in saidvalve-chamber on the other side of said valve communicating with the egress end of said passage, a valve -lever adapted to be operated to move said valve off its seat thereby opening communication between the two ends of the valve-chamber, and means for locking said valve-lever.

22. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve-chamber interposed in said passage, a valve seated in said valve-chamber and normally closing communication between the two ends thereof, a port in said valvechamber on one side of said valve communicating with the ingress end of said passage,

a port in said'valve-chamber on the other sideof said valve communicating with the egress end of said passage, a valve-lever adapted to be operated to move said valve off its seat, and alocking-lever adapted to lock said valvelever.

23. In a pneumatic hammer, the combination with the handle, of an air-passage there- 'in, a valve-chamber interposed in said passage, a valve seated in said valve-chamber and normally closing communication between the two ends thereof, a port in said valvechamber on one side of said valve communieating with the ingress end of said passage, a port in said valve-chamber on the other side of said valve communicating with the egress end of said passage, a spring adapted to hold said valve in its normal position, a valve-lever adapted to move said valve away from its normal position, but normally held by the valve-spring in inoperative position, a lock} ing-lever adapted to normally look said valve in its inoperative position, and a spring normally holding said locking-lever in'its looking position.

24. In a pneumatic hammer, the combination with the handle, of an air-passage therein, a valve-chamber interposed in said passage, a valve seated in said valve-chamber and normally closing communication between the two ends thereof, a port in said valvechamber on one side of said valve com municating with the ingress end of said passage, a port in said valve-chamber on the other side of said valve communicating with the egress end of said passage, a spring adapted to hold said valve in its normal position, a pivoted valve-lever and a thumb-piece thereon, a pivoted locking-lever and a finger-piece thereon, and a spring adapted to normally hold said locking-lever into position to lock said valve-lever.

25. In a pneumatic hammer, the combination with a handle having an open portion, ot'an air-passage in the handle, a valve-chamber interposed in said passage, a valve seated in said valve-chamber and normally closing communication between the two ends thereof, a port in said valve-chamber on one side of said valve communicating with the ingress end of said passage, a port in said valvechamber on the other side of said valve communicating with the egress end of said passage, a spring adapted to hold said valve in its normal position, a pivoted valve lever whose pivoted end has a shoulder engaging said valve, a thumb-piece and a projection on the free end of the valve-lever, a pivoted locking-lever whose free end engages said projection, a finger-piece on thelocking-lever extending into said open portion, a pin movable in a chamber formed in the handle, and a spring seated in said chamber normally pressing said pin against the end of the locking-lever adjacent to its pivot.

26. In a pneumatic hammer, the combination with the handle having an open portion, an air-passage in the handle, a valve in said air-passage, a pivoted valve-lever having a thumb-piece on one side of its free end, a pivoted locking-lever having a finger-piece between its ends extending into said open portion, the free end of said locking-lever engaging the valve-lever at a point adjacent to its free end and opposite the thumb-piece so as to lock the valve-lever, whereby a movement of'the finger-piece toward the thumbpiece will unlock the valve-lever and permit the thumb-piece to be moved toward the finger-piece.

In testimony of which invention I have hereunto set my hand, at Easton, Pennsylvania, on this 20th day of May, 1903.

CHARLES H. HAESELER.

Witnesses:

A. H. TAYLOR, E. S. APGAR. 

